1/*********************************************************************** 2Copyright (c) 2006-2011, Skype Limited. All rights reserved. 3Redistribution and use in source and binary forms, with or without 4modification, are permitted provided that the following conditions 5are met: 6- Redistributions of source code must retain the above copyright notice, 7this list of conditions and the following disclaimer. 8- Redistributions in binary form must reproduce the above copyright 9notice, this list of conditions and the following disclaimer in the 10documentation and/or other materials provided with the distribution. 11- Neither the name of Internet Society, IETF or IETF Trust, nor the 12names of specific contributors, may be used to endorse or promote 13products derived from this software without specific prior written 14permission. 15THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 19LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25POSSIBILITY OF SUCH DAMAGE. 26***********************************************************************/ 27 28#ifdef HAVE_CONFIG_H 29#include "config.h" 30#endif 31 32#include "main.h" 33 34/* Decode parameters from payload */ 35void silk_decode_parameters( 36 silk_decoder_state *psDec, /* I/O State */ 37 silk_decoder_control *psDecCtrl, /* I/O Decoder control */ 38 opus_int condCoding /* I The type of conditional coding to use */ 39) 40{ 41 opus_int i, k, Ix; 42 opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], pNLSF0_Q15[ MAX_LPC_ORDER ]; 43 const opus_int8 *cbk_ptr_Q7; 44 45 /* Dequant Gains */ 46 silk_gains_dequant( psDecCtrl->Gains_Q16, psDec->indices.GainsIndices, 47 &psDec->LastGainIndex, condCoding == CODE_CONDITIONALLY, psDec->nb_subfr ); 48 49 /****************/ 50 /* Decode NLSFs */ 51 /****************/ 52 silk_NLSF_decode( pNLSF_Q15, psDec->indices.NLSFIndices, psDec->psNLSF_CB ); 53 54 /* Convert NLSF parameters to AR prediction filter coefficients */ 55 silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psDec->LPC_order ); 56 57 /* If just reset, e.g., because internal Fs changed, do not allow interpolation */ 58 /* improves the case of packet loss in the first frame after a switch */ 59 if( psDec->first_frame_after_reset == 1 ) { 60 psDec->indices.NLSFInterpCoef_Q2 = 4; 61 } 62 63 if( psDec->indices.NLSFInterpCoef_Q2 < 4 ) { 64 /* Calculation of the interpolated NLSF0 vector from the interpolation factor, */ 65 /* the previous NLSF1, and the current NLSF1 */ 66 for( i = 0; i < psDec->LPC_order; i++ ) { 67 pNLSF0_Q15[ i ] = psDec->prevNLSF_Q15[ i ] + silk_RSHIFT( silk_MUL( psDec->indices.NLSFInterpCoef_Q2, 68 pNLSF_Q15[ i ] - psDec->prevNLSF_Q15[ i ] ), 2 ); 69 } 70 71 /* Convert NLSF parameters to AR prediction filter coefficients */ 72 silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 0 ], pNLSF0_Q15, psDec->LPC_order ); 73 } else { 74 /* Copy LPC coefficients for first half from second half */ 75 silk_memcpy( psDecCtrl->PredCoef_Q12[ 0 ], psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( opus_int16 ) ); 76 } 77 78 silk_memcpy( psDec->prevNLSF_Q15, pNLSF_Q15, psDec->LPC_order * sizeof( opus_int16 ) ); 79 80 /* After a packet loss do BWE of LPC coefs */ 81 if( psDec->lossCnt ) { 82 silk_bwexpander( psDecCtrl->PredCoef_Q12[ 0 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 ); 83 silk_bwexpander( psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 ); 84 } 85 86 if( psDec->indices.signalType == TYPE_VOICED ) { 87 /*********************/ 88 /* Decode pitch lags */ 89 /*********************/ 90 91 /* Decode pitch values */ 92 silk_decode_pitch( psDec->indices.lagIndex, psDec->indices.contourIndex, psDecCtrl->pitchL, psDec->fs_kHz, psDec->nb_subfr ); 93 94 /* Decode Codebook Index */ 95 cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ psDec->indices.PERIndex ]; /* set pointer to start of codebook */ 96 97 for( k = 0; k < psDec->nb_subfr; k++ ) { 98 Ix = psDec->indices.LTPIndex[ k ]; 99 for( i = 0; i < LTP_ORDER; i++ ) { 100 psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER + i ] = silk_LSHIFT( cbk_ptr_Q7[ Ix * LTP_ORDER + i ], 7 ); 101 } 102 } 103 104 /**********************/ 105 /* Decode LTP scaling */ 106 /**********************/ 107 Ix = psDec->indices.LTP_scaleIndex; 108 psDecCtrl->LTP_scale_Q14 = silk_LTPScales_table_Q14[ Ix ]; 109 } else { 110 silk_memset( psDecCtrl->pitchL, 0, psDec->nb_subfr * sizeof( opus_int ) ); 111 silk_memset( psDecCtrl->LTPCoef_Q14, 0, LTP_ORDER * psDec->nb_subfr * sizeof( opus_int16 ) ); 112 psDec->indices.PERIndex = 0; 113 psDecCtrl->LTP_scale_Q14 = 0; 114 } 115} 116